Air filter



July 14,A 1931. E. BISHOP 1,814,428

AIR FILTER Filed Marh 29, 1930 2 sheets-sheet I1 .t t.: -I...a..$$$...... .n :222::

E. BISHOP AIR FILTER Julyl 14, 1931.

2 Sheets-Sheet 2 Filed March 29, 1930 y 51 y /N VENTO/c l, y Edmund hobQMS.

A TTORNEY Patented july 14, 1931 sar EDMUND BISHOP, F NEW YORK, N. Y.

AIR FELTER Application filed March 29, 1930. Serial No. 439,909.

The invention relates to a filter and particularly to that type offilter which is adapted to remove dust or other impurities from air.

Une of the principal objects of the improved filter is to provide anair-cleaning.

apparatus of'great efliciency, that is one in which a maximum amount ofa1r may be cleaned or purlfied with a minimum amount of operatingexpense.

A still further object is to provide filter media which :will have greatlasting qualities and will not deteriorate under unfavcrable atmosphericconditions.

Another object is to provide improved means for removing from the filtermedia all dust or other impurities that are collected thereon.

Still another object is to provide a device of this character, which isexceedingly simple and inexpensive in construction and economical inoperation.

The foregoing and numerous other objects and advantages will becomeapparent as this specification proceeds.v Referring to the drawingsforming apart thereof and in which one simple embodiment of theinvention is illustrated:

Figure lis a front elevation of the filter;

Figure 2 is Ka sectional view on the line 352-4-2ofFig11re1;

Figure 3 is` a sectional plan view on the line 3-3 of Figurel; 1-

Figurevli is an end levation looking toward the right of Figure 1;

Figure 5 is a fragmentary plan v iew of the filter. medium, successivelayers being brrlren away vfor clearnessof illustration; an

Figure 6 is a detail sectional view of the lter medium.

Referring again to they drawings, the reference numeral 10 designatesthe frame or casingV for the filter. This frame or easing mayvarygreatly in details of construction but comprises essentially, open sides11 and 12, an open top 13, an open end 14, a closed end 15 and a closedbottom 16.

The casing is in effect a frame in which the open sides and open topconstitute a large area through which impure air may be drawn. A filtermedium 17 ,of improved construction which will be hereinafter describedpasses over said open sides 11 and 12 and the open top 13. Sealing means18 are indicated between the edges of the filter media and the casing soas to exclude all air from the casing exceptwhat is admitted through thefilter media.

The filter media is preferably continuous and may be carried and rotatedVin the casing in any desired or suitablemanner. The means illustratedonly by way of example for supporting and rotating the lilter mediacomprises shafts 19 and 2O suitably mounted in the casing. These shaftscarry sprockets 21 over which sprocket chains 22 pass. The edges of `thefilter media are securel t'o the sprocket chains 22. Either of theshafts 19 or 2O may be driven from any suitable source of power. Asstated', this arrangement may be widely varied:

The open sides 11 and 12 are termed the side inlets and the open top 13,thetop inlet.v The open end lll is termed the outlet and the outlet ispreferably connected to a blower or other suctionin'eans not 'thoughtnecessary to illustrate. It Listhought to be I yapparent from theforegoing `that themaxi'-V mumfarea of the lfilter 1s exposed' .totheincoming impure air, so as to provideairapparatus of great efficiency.

Novelmeans are `provi the 'filter media` and collecting and Vremovingdust or other impurities collected thereon. This means is preferablylocated at the lower part of the filter media and comprises a pluralityof slotted pipes 25 extending across -the entire filter media. Thesepipes are preferably connected toA a manifold 26 outside of the casing.A pipey 27 connects this manifold to a suitable source of vacuumpressure for collecting and removing dust or other impurities on thefilter media. Thus an eective and ded forl cleaning u flo simple methodis supplied for cleaning the filter media.

The apparatus described is extremely simple, comprising in effect, onlythree 5 parts, the iilter media, the air tight casing and the vacuumsystem. The filter media is illustrated in detail in Figures 5 and 6. Itcomprises a layer of loosely or coarsely Woven material 30 such asburlap, asbestos or cocoa matting, a layer of paper 3l, which may befrom 6 to ply depending upon the conditions under which the lilter mediais used, and a layer of cheesecloth 32. The various layers of materialare separated by large mesh wire screens 33 and are confined by sheetsof expanded metal 34. In this manner an eiicient filter is formed. The l30 removes the coarse ticles from 'the air and cheesecloth 32 extractsall the finer particles. he vacuum system'continuously .cleans the ltermedia 1n 'an effective and efficient manner and thus a ilter medium isprovided which will have great lasting qualities and will notdeteriorate under unfavorable atmospheric conditions. The expanded metaland Wire mesh act as stren thenin means and insure long life tothe lter.trated the lter is made of one piece. ever, if desired, it may be madeand abl will be in sections or panels.

and ideal dry oosely woven fabric dirt or large parthe paper 31 andHowprobumerous changes may be made in details construction andarrangements of parts without departing from the spirit of the inventionor the scope of the appended' claims.

I claim:

1. A device of the character described having in combination asubstantially rectangular casing/provided with air inlets at both sides,an air inlet at the top and an air outlet at one. end, and a continuousfilter medium adapted' to pass over both of said side inlets and saidtop inlet.

2. A device of the character described having in combination asubstantially rectangular casing provided with air inlets at both sides,an air inlet at the top, andan air outlet at one end, a continuouslter'mediu'm adapted to pass over both of said side inlets and said topinlet, and means at the lower 55,part of said filter medium for.collecting and removing dust or other impurities that are collectedthereon.

-3. A device of the character described having in combination 'asubstantially rectangular casing provided with air inlets at both sides,an air inlet at the top, and an air outlet at one end, a continuousfilter medium adapted to pass over both of said side inlets and said topinlet, and vacuum means at cloth confined lectin and removin dust orities t at are collecte thereon.

4. A) device of the character described havingin combination asubstantially rectangular casing provided with air inlets at both sides,an air inlet at the top, and an air outlet at one end, a continuousfilter medium adapted to pass over both of said side inlets and said topinlet and a plurality of slotted pipes extendingbeneath the lower partof said filter medium through which vacuum pressure may be ap lied forcollectin and removin dust or ot er impurities co ected on said ltermedium.

5. A device of the character described having in combination asubstantially rectangular casing provided with air inlets at both sides,an air inlet at the top, and an air outlet at one end, a continuousfiltermedium adapted to pass over both of said side inlets and said topinlet, a plurality of slotted pipes extending beneath the lower part ofsaid filter medium, and a manifold outside of said casing to which saidpipes are connected and through which vacuum pressure may be suppliedfor collecting and removing dust or other impurities collected onsaidfilter medium.

6. A device of the character described having in combination a, casingprovided with air inlets at both sides and an air loutlet at one end,and a continuous lilt'er medium other: impuradapted to pass over both ofsaid side inlets, said filter medium comprising layers of a looselywoven fabric, paper and cheese by sheets of expanded metal. 7. A filtermedium comprising layers of a coarsely woven fabric, aper and cheesecloth confined by sheets o expanded metal. 8. A filter medium comprisinga layer of a coarsely woven fabric such as burlap or similar material, alayer of layer of cheese cloth, all of said layers bepaper, and a mgseparated by a large mesh wire screen and confined by sheets of expandedmetal.

9. A device of the character described, comprising in combination asubstantially rectan ,l ar casing provided with air inlets at bot sides,a. separate auxiliary air inlet spaced from sald first mentionedairrinlets and located on another side of said casing,

an air outlet at one end of said casing, and

a continuous filter medium adapted to over both of said side inlets andsaid iliary inlet.

Signed at N ewI York city in the county of New York and State of `lTewYork this 21st day of March A. D. 1930.

EDMUND BISHOP...

P858 aux- 65 the lower part of said filter medium for col-

